Thanks Guys. Sorry but I haven't been able to get any internet connection since posting this thread.

Have done 3 scanreg /restores back 4 days. (I'm on Win 98SE)

Unplugged and replugged my NTL modem and Router at least 4 times and have only just managed to get back on line.

I have an analogue modem installed for just this sort of problem but when I plugged it in to the telephone socket it wasn't recognised. I just sent a fax via the analogue modem and it was sent and received all OK. But if I try to access the internet using the dialup modem I get an error message "Modem not connected" Very strange!